Shimano WH-M778 Service Instructions

WH-M778
Shimano
Brand
Shimano
Model
WH-M778
Category
Bicycles
Type
Service Instructions

This manual is also suitable for

Technical Service Instructions SI-4FE0B-002
WH-M778
WH-MT65-F15
Front Wheel
In order to realize the best performance, we recommend that the following combination be used.
Model WH-M778 WH-MT65-F15
Rotor SM-RT79/SM-RT76 SM-RT64/SM-RT75
Specifi cations
No. of spokes 24
Rim width 23.3 mm
Rim size 26”
Applicable tire size 26 x 1.5 ~ 2.25
Applicable brakes Disc brake
Replacing the spokes
1. Pass the washer and plug over the spoke.
2. After inserting the spoke into the hole in the hub
fl ange, tighten the nut. When installing, use the
spoke stopper to secure the spoke so that it does not
turn, and then insert a screwdriver or similar tool into
the groove in the nut to screw in the nut.
3. Turn the plug clockwise to screw it into the screw hole
in the rim.
At this time, use the spoke stopper to stop the spoke
from turning.
Note:
● If the washer is not installed, it will
not be possible to adjust the spoke
tension, so be sure to include the
washer.
● Tighten the nut as far as the edges
of the thread.
Spoke lacing
Lace the spokes as shown in the illustration.
Maintenance
These units can be disassembled as shown in the illustrations. Grease should be applied to each part at
periodic intervals.
Applying grease
DURA-ACE grease
(Y-04110000)
Applying grease
DURA-ACE grease
(Y-04110000)
The cover on the right side of the
hub unit cannot be disassembled.
No. of balls: 17 Ball size: 5/32"
Note:
WH-M778
No. of balls: 15 Ball size: 3/16"
WH-MT65-F15
<Assembly>
Install the axle pipe, and then use the special tools (TL-HS21 and TL-HS22) to tighten the lock nut so as to
double-lock the mechanism as shown in the illustration.
Use the TL-HB15/16 to adjust the hub rotation performance.
TL-HS22
TL-HS21
Tighten
A
xle pipe
Tightening torque:
30 - 35 N·m {261 - 305 in. lbs.}
Installation of the rotor
Rotor fixing lock ring
TL-FC36
Tightening torque:
40 - 50 N·m {347 - 435 in. lbs.}
General Safety Information
WARNING
● The WH-M778/WH-MT65-F15 is not designed for downhill bicycle riding and freeriding.
However, depending on the riding condition, the hub axle could develop a crack, which may
result in failure of the hub axle. This can lead to an accident that could result in serious injury
or even death. Before riding, you should carefully check your hubs to make sure that there
are no cracks in the axles , and if you fi nd any sign of a crack or any other unusual condition,
do NOT use the bicycle.
● The securing method and tightening torque for the front wheel both vary depending on
the type of front suspension fork being used. When installing the front wheel to the front
suspension fork, always be sure to follow the directions given in the Service Instructions for
the front suspension fork. If the directions are not followed, the front wheel may fall out of the
front suspension fork and serious injury may result.
● Check that the wheels are fastened securely before riding the bicycle. If the wheels are loose
in any way, they may come off the bicycle and serious injury may result.
● The wheel is designed for cross-country riding. Do not use it for downhill riding, otherwise the
wheel may become bent or otherwise damaged, and accidents
may occur as a result.
● If the axle release lever is not used correctly, the wheel may
come off the bicycle and serious injury could result.
● If the axle release lever is on the same side as the rotor, there
is the danger that it may interfere with the rotor, so check that it
does not interfere.
● These wheels are designed exclusively for use with disc brakes.
Do not use these wheels with rim brakes.
● Be sure to carefully read the Service Instructions for the disc brakes also.
● Obtain and read the service instructions carefully prior to installing the parts. Loose, worn or
damaged parts may cause the bicycle to fall over and serious injury may occur as a result.
We strongly recommend only using genuine Shimano replacement parts.
● Read these Technical Service Instructions carefully, and keep them in a safe place for later
reference.
CAUTION
● Do not use rim tape. Rim tape may make it diffi cult to remove and install the tire, and the tire
or tube may become damaged or the tires may suddenly puncture and come off, and severe
injury may result.
NOTICE
● Use genuine Shimano spokes, nuts, plugs and washers, otherwise damage to the rim and
hub unit may result.
● The air pressure should be within the range of 200-400 kPa {29-58 psi}.
● Be careful not to overtighten the plugs when adjusting the spoke tensions. If the plugs are
overtightened, damage to the rim may result.
(We recommended that you ask authorized bicycle dealers to make the adjustments.)
● We do not recommend that you use general-purpose alkaline puncture repair agents, as they
may cause the rims to corrode and allow air leaks to occur.
● When using the special tool (TL-FC36) to remove and install the rotor mounting ring, be
careful not to touch the outside of the rotor with your hands. Wear gloves to protect your
hands from getting cut.
Note
● If the wheel becomes stiff and diffi cult to turn, you should lubricate it with grease.
● Do not apply any oil to the inside of the hub, otherwise the grease will come out.
● Special spoke wrenches are available as optional accessories.
● We recommend that you ask authorized bicycle dealers to adjust the spoke tensions if there
is any initial play in the spokes and after the fi rst 1,000 km of riding.
● Do not use detergents or chemical cleaners to wipe the wheel, otherwise they may cause the
air sealant that has been applied to the joints in the rim to peel off.
● Do not use detergent or other chemicals when wiping the wheel, otherwise it may cause the
sticker on the rim to peel off.
● Refl ectors are also sold separately. Please ask your bicycle dealer for details.
Model number Specifi cation Color
RR-550-WUW SW W/O BRACKET JIS / CPSC White
RR-550-WUA SW W/O BRACKET AS Amber
RR-317-WUA SW W/O BRACKET DIN Amber
● For maximum performance we highly recommend Shimano lubricants and maintenance
products.
● Parts are not guaranteed against natural wear or deterioration resulting from normal use.
C
Jan. 2010 by Shimano Inc. AWS. IZM. Printed in Malaysia
* Service Instructions in further languages are available at :
http://techdocs.shimano.com
Please note: Specifi cations are subject to change for improvement without notice. (English)
One Holland, Irvine, California 92618, U.S.A. Phone: +1-949-951-5003
Industrieweg 24, 8071 CT Nunspeet, The Netherlands Phone: +31-341-272222
3-77 Oimatsu-cho, Sakai-ku, Sakai-shi, Osaka 590-8577, Japan
Axle release
lever
Rotor
1
Washer
Plug
Spoke stopper
Spoke
Nut
2
3
Spoke tension value
Right side Left side
600 - 1000 N
(135 - 225 lbf)
900 - 1350 N
(202 - 304 lbf)
* These values should be used as a guide only.
  • Page 1 1

Shimano WH-M778 Service Instructions

WH-M778
Shimano
Brand
Shimano
Model
WH-M778
Category
Bicycles
Type
Service Instructions
This manual is also suitable for
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